Knockdown covered carton



April 13, 1954 R. G. HAAs KNOCKDOWN COVERED CARTON 2 Sheets-Sheet lFiled Dec. 22. 1950 f m. z; 7 z z :W V k/ .7 ,Www W a 5 z my/U w. f 4,

April 13, 1954 2 Sheets-Sh'eet 2 FJ' led Dec. 22, 1950 Patented Apr. 13,1954 KN'OCKDOWN COVERED CARTON Richard G. Haas,` Kalama zoo, Mich.,assig'nor to Sutherland Paper Company, Kalamazoo, Mich.

Application December 22, 1950, Serial No. 202,209

'i Claims.

This invention relates to improvements in knockdown covered cartons.

The main objects of this invention are:

First, to provide a covered carton formed of an integral blank which maybe quickly erected from the flat blank form and which when erected isstrong and rigid, the interengaging parts serving to effectively braceeach other.

Second, to provide a carton of this Character which may be economicallyproduced from relatively light stock and at the same time is effectivelyretained in the erected position.

Objects relating to details and economies of the invention will appearfrom the description to follow. The invention is pointed out in theclaims.

`A preferred embodiment of the invention is illustrated in theaccompanying drawings, in which:

Fig. 1 is a front perspective view of a carton 5 embodying my inventionwith the cover in partially closed position.

Fig. 2 is a transverse section on a line corresponding to line 2--2 ofFig. 1 with the cover in fully closed position.

Fig. 3 is an end elevational view illustrating certain of the steps oferecting the carton.

Fig. 4 is a plan view of the blank, the hinging scores or portions beingindicated by dotted lines.

The embodiment of my invention illustrated is formed of an integralblank and comprises a bottom I, front wall 2 and rear wall 3,`the wallsbeing hingedly connected to the edges of the bottom by the hingingscores indicated by the dotted lines 4-4. The end walls 5 are hingedlyconnected to the ends of the bottom by the hinging scores 6-6. The rearwall 3 has a cover 1 hingedly connected to its upper edge at 8. Thecover is provided with a closure flap 9 hingedly connected to itsswinging edge at Ill. The front and rear` walls have corner fiaps I Ihingedly connected thereto at 12.

The end walls 5 have closure flaps |3 on their upper edges hingedlyconnected -thereto at Id. The corner flaps have recesses or notches IEformed in their outer 'side edges to provide spaced bottom and toptongues l6 and ll. The adjacent edges of these notches are formed withdiverging curves |8. The upper edges of the corner flaps are notched at19 to provide hook-like portions'20 on the upper ends of the tonguesI'l.

The end walls have vertically spaced pairs of slits 2| and 22 formedtherein, these slits being of general U-shape and disposed in facingrelation thus providing defiectable portions 23 and 24 facilitating theengagement of the tongues with the corresponding slits. It will be notedthat the lower ends of the slits 2! extend to the hinge connections 6for the end walls to the bottom and that the upper ends of the slits 22eX- tend to the hinge connections 14 for the end closure fiaps to theend walls.

`When the carton is erected, the end Walls are swung to erected positionand the front and rear walls then swung upwardly as shown in Fig. 3 withthe bottom tongues inserted through the slits 2|. Continued erectingmoveinent of the front and rear walls engages the tongues l'! with theslits 22 or the tongues are inserted through the slits and the upwardlyprojecting tips or hook portions 20 of the tongues ll are engaged withthe upper edges of the angularly disposed portions 25 of the slits 22,that is, they interlock therewith, as is shown in Fig. 2, thus lockingthe parts in erected position.

The bottom edges 26 of the corner fiaps are aligned with the hingeconnections 4 for the front and rear walls to the bottom so that whenthe walls are in completely erected position, the tongue portions IB arein supported engagement with the bottom at the inner sides of the endwalls, this resulting in a bracing of the parts. The tip portions 20 ofthe tongues I'l are engaged by the inturned end closure fiaps 13. Thecurved edges 18 of the tongues facilitate the engagenient of the tongueswith the slits.

The front wall is provided with a dovetailed tongue 21 formed by thenotches 28 and the slits 29 in the front wall. The closure flap 9 isprovided with a C-shaped slit 33 which receives the tongues 21 of thecover fiap when it is in closed position. This flap 9 is tucked betweenthe front wall and the front edges of the end closure flaps IB. Thisresults in a very secure locking of the cover in closed position. Thecover holds down the end closure fiaps which not only results in aneffective closure at the ends of the cover but serves to retain thecover closure fiap in locked position and prevents the corner flaptongues from becoming disengaged with the end walls. It will be notedthat the corner flaps when their tongues interlock with the end walls,as described, provide a very effective interlocking engagement as Wellas a structure in which the parts cooperate to brace and support eachother.

I have illustrated and described my carton, which is well adapted as acarton for baked' goods or other merchandise, in a highly prac'- ticalembodiment thereof. I have not attempted to illustrate or 'describeother embodiments or adaptations as it is believed that this disclosurewill enable those skilled in the art to embody or adapt my inwention asmay be desired.

I-Iaving thus described my invention, what I claim as new and desire tosecure by Letters Patent is:

1. A carton formed of an integral lblank and comprising a bottom, front,rear and end walls hingedly connected to 'the b'ottom, and a flcoverhinge'dly'connect'ed to lthe upper'edge'ofthe rear wall, the coverhaving a closure fiap on its swinging edge, the end walls having closurefiaps on their upper edges, the front and rear vwalls having cornerfiaps hingedly connected to their 'endsv said corner fiaps being ofl`substanti'al horizontal dimension from adjacent the "lower-edges ofthe front and rear walls to adjacent the top 'edges theredf, the outeredges of the corner fiaps having central notches therein providingspaoed upper and lower tongues, `the bottom edges of the corner flapsbeing'aligned in 'the blank =with the -hinging connections 'for thefront and rear walls vto the' bottom, the upper edges of 'the 'cornerflaps being notched ``to provide 'upwardly Vdirected hook-like tips forTthe upper tongue's, the end walls ihaving vertically spaced pairs offalcing generally U-shaped slits with which =correspond- :ing to'ngueslof said 'corner fiaps maybe engaged, the lower fendsof the lower-slitsterminating at :thehinging connection for the -end walls to the'`bottomy the upper ends'zof .the upper slits'terminating at the `hingeconnections Vfor Vthe end wall closure :fiaps ztorthe end 'walls 'so'that when the -carton :is erected'with the'tongues of the corner Vfiapsengaged 'in the =.corresponding elite, porftions'of the v'bottornedges'of the lbottomtongues are in eupported engagement with the bottomland the hook portions of 'the upper tongues :are

in retaining f'engagernent with edge 'rportions of the upper slits andthe tips of ithe'uppe'r ftongues 'are .in engagement with the Vendclosure fiaps.

2. .A carton xfo'rnied ;of an integra'l 'blank and coinprising a"bottom, front, Irear 'and end walls hingedly connected vto the bottom,and a cover hingedly connected to the upper edge oftherear wall,thecoverhavinga closure flap-on its-swing- -ing edge, the front and rearwalls having corner iiaps hingedly connected to ytheir ends, said cornerflaps being of substan'tial horizontal di'- -mension from adjacent thelower 'edges of the front and rear walls to adjacent the ltop edgesithereof, the outer edgesof thecorner ffl'aps'hav- 'ing central notchestherein providing spaced upper and lower tongues, the upper -edges ofthe corner fiaps Vbeing notched to provide upwardly directed book-liketips 4for 'the upper tongues', the end walls vhaving vertically spacedpairs of 'facing generally U-shaped s'lits with which cor- 'respondingtongues 'of said corner flaps :may be engaged so that When the carton is'erected with the tonguesof the corner flaps 'en'gaged in 'thecorresponding 'slits, the hook portions of the upper tongues being linretaining 'engagement with 'edge portons of the upper slits, the bot-`tomedges of the Vlower tongues'being insupported relation with Vthevbottorn Wall when ithe carton is erected.

3. A carton lforrned of an integral blank and comprising a bottom,front, rear and end Walls. hingedly connected to the bottom, and =a'cover `ling Vcentral notches therein .providing spaced upper vand lowertongues,`the adjacent edges of the tongues being divergingly curved, theupper edges of the corner flaps being notched to provide 'upwardlydirected book-like tips for the upper Vtongues, the end walls havingVertically '-'spaced pairs of 'fa'cing generally U-shaped slits withwhichfcorresponding tongues of said corner .fiaps may be .engaged sothat when the carton is erected with the tongues of the corner fiapsengaged -in the corresponding slits, the hook portions of the uppertongues being in retaining engagement ywith 'edge portions of theupperslits, the bottom edges o'f the lower 'tongues being 'in supportedrelation With the `'bottom wall when the carton Vis erected. i

4. A 'carton formed of an integral zblank and: comprising abottomffront,rear and lend 'walls hingedly connected to the bottom, -and a'coverhingedly oonnected'to'theupper edgeof'the rear wall, the-cover having aclosure fiap on its swinging edge, the end walls 'having closure `fiapson their upperedges, the `front-and rear 'Walls 'having corner flapshingedlyconnected to their end's 'and having spaced 'upper and 'lower.tongues "the upper tongues 'having 'upwardly directed 'hook portions,the bottom edgesof the=corner fiapsbeing aligned in the blank With thehinging "connections 'for the frontand'rear 'walls to |the bottom, theend wallSf-having 'Vertically fspacedcpairs of slits with whichcorresponding tongues :of said corner fiaps may 'be 'engagect vthe lowerYends of the lower slits terminatin'g at vthe hinging connection for theend walls to fthe '*bottom, 'the up- .per .ends of 'the upper-slits'being' angled and 'terminating `at the hinge connections for the -endwall closure flaps to the end walls -whereby When the Vcarton is erectedwith `the tongue of the corner iiaps .engaged .in the correspondin'gslits,

i portions of -the `bottom edges of the fbottom tonguesare'in='supported 'engagement with the bottom and the hook portions of'the upper tongues are in retaining'engagement with edge .portions of:the upper'slits'and the 'tips of the upper tonguesare in 4engagement"with -the end closure fiaps.

References :Cited in the file of this patent UNITED STATES PATENTS

